Thanks everyone for your input - feel much wiser, but still a bit unsure on exactly what to do. I'll post questions to your various responses, but all very much appreciated.
Thanks Silfi
Yes - the 'how to repair' (when I have established what repair to make) is a good question!
At present, I have bought and fitted polycarbonate sheets over the outside of two of the windows, and am ventilating the gap between. This is proving very effective at drying the sashes...
Thanks Doug. Yes, my windows (rebate) is definitely the sealed type. My critical question is whether the sealing of the bead to the glass failed because:
1) No gap between DGU and frame - expansion issues(?)
2) Bead too small - unsupported(?), lack of meaningful pin(?)
3) Wrong sealant -...
....and thank you also for your second post.
Understood re thinner DGU and bigger bead.
However, don't understand the idea of the 5 x 5 rebate. Is this in the right angle corner of the bead (where bead, glass and frame all meet)? Or maybe at the thin part of the bead - giving a visible 5x5...
Thanks - Robin' - I suspect your opening two opinions are only too true. The parting and staff beads all appear to be s/w, and finished poorly - maybe just primed / u/c - certainly not to the same finish to the h/w shop built and sprayed frames (so corners cut at install?). And yes - small...
Hi all.
I have lots of Sash windows installed about 10 years ago - hardwood frames / sashes with double glazed 4/16/4 units in a 30mm rebate with a 6 x 16mm external bead. Seems like the design was badly flawed because the sealing between the bead and the glass has failed on most windows...